Win 7 restore from Win 8.1 Pro

Hi everyone, Almost 3 months ago, I have freshly installed Win 8.1 Pro for my Asus Laptop which has been using Win 7 Home Premium x64. However, I want to go back to Win 7 Home premium, and i tried pressing F9 key in start, but it doesnt work. When i am installing Win 8, there were Windows.OLD folder, and i had deleted it. So, i guess i also deleted win 7 recovery. Also, in disk management, I...